Gravity-hinge



W. W. WOOD.

GRAVITY HINGE. I

APPLICATION FILED MAY 9, 1921.

Patented 0% 11, 1921.

PATENT OFFICE.

WALTER W. WOOD, OF SEATTLE, WASHINGTON.

GRAVITY-HINGE.

Specification of Letters Patent.

I Patented Oct. 11, 1921.

Application filed May 9, 1921. Serial No. 467,892.

7 To all whom it may concern:

Be it known that I, YVALTER W. 001), a citizen of the United States, andresiding at Seattle, in'the county of King and State of Washington, haveinvented certain new and useful Improvements in Gravity-Hinges, of whichthe following is a specification.

This invention relates to improvements in door hinges.

A particular object of the invention is to provide a door hinge of thegravity type so that the door will rest directly on the floor whenclosed and will be raised therefrom when opened, the usual sill beingomitted.

Another object of the invention is to provide means carried by the doorplate so that it may be adjusted vertically with respect to the jambplate in order that the door may be lowered to contact with the floor asthe bottom wears oif.

This hinge is of the gravity type which will normally assume the closedposition by gravity.

In the drawings:

Figure 1 shows a partial side elevation of the bottom portion of a doorand jamb showing one hinge applied near the lower end thereof.

Fig. 2 shows a sectional view on line 2-2 of Fig. 1.

1 indicates the bottom portion of the door which is hinged to the doorjamb 2, and in closed position is adapted to rest upon the floor, asindicated at 3 omitting the usual sill. The hinges for mounting the doorare all the same and only the lower one is illus trated, which includesthe door plate a secured to the door by screws 5, a portion of whichprojects beyond the edge of the door and is formed at the end with aknuckle 6 having a bore 7. The jamb plate 8 is secured to the door jamb2 in any suitable manner preferably by screws 9, and is formed with anoutwardly projecting upwardly curved arcuate cam projection 10 having anopening at 11. Near the upper end of the plate is a lateral projection12, formed with an opening to receive a hinge pin 13 which passesthrough the bore 7 of the plate 4, and the lower end of which projectsthrough the opening 11 in projection 10, thereby hinging the door to thejamb.

A supporting plate 14 is adjustably mounted on the door plate 4: inguides adj acent the enlarged portion 6 and is adapted to be locked inan adjusted position by the lock nut 15. The lower end of the supportingplate is provided with a pair of ears 16 in which is rotatably mounted aroller 17 on the pin 18. The door plate 4: is formed with a projection19 in which is mounted an ad usting screw 20 which is adapted toengagethe upper end of the supporting plate provldlng means foradjusting the same whereby wear on the bottom of the door may becompensated for.

In mounting a door with hinges of the type above described it will benoted that the door when closed may be adjusted to rest on the floor,and when opened the roller 17 riding on the upwardly curved surface ofprojection 10 will raise the door from the floor so that it may beeasily opened without the usual friction and binding with the floor. Itwill also be noted that this door will automatically close by gravitywhen released from its open position without the aid of a door closer.The wear on the bottom of the door due to. the friction thereof with thefloor may be compensated for by adjusting the screw 20 on the door plate4 to lower the door and the plate with respect to the j amb.

In storage plants, ice boxes, and other places where it is desired tohave a door structure which is absolutely tight and free fromobstruction at the bottom, so that trucks may be wheeled through thedoor without obstruction, a hinge of the type above described is veryuseful in that, as above stated, it is adapted to be adjusted to permitthe door to rest on the floor when closed and thus prevent a crack atthe bottom of the door, and also eliminates the use of a sill. Thecracks around the other portions of the door are usually closed byprojections from the door jamb so that this part is taken care ofthereby.

What I claim is:

1. A gravity hinge comprising a jamb plate having a projection formedthereon with an upwardly inclined cam surface, a door plate pivoted tosaid jamb plate and adapted for vertical movement with respect thereto,a supporting plate slidably mounted on the door plate, a roller carriedby said supporting plate and adapted to engage said cam surface, meansfor locking the supporting plate with respect to the door plate, and

separate means carried by the door plate for adjusting the supportingplate with respect thereto.

2. A gravity hinge, comprising a j amb plate, having a projection formedthereon with an upwardly inclined cam surface, a door plate having aknuckle on the end portion thereof, a pintle carried by the jamh platepassing through the knuckle and pivotally mounting the door platethereto and permitting vertical movement of the door plate with respectto the jamh plate, a supporting plate having a roller mounted in thelower end thereof adapted to engage the cam surface, a rib'formed on thedoor plate spaced from the knuckle adapted to cooperate with a portionof the knuckle to form a guide for the supporting plate, a set screwmounted in a projection on the upper edge of the door plate adapted toengage the upper end of thesupporting plate, and looking means carriedby the door plate and extending through a slot formed in the supportingplate for rigidly securing the supportingplate to the door plate inadjusted position.

In testimony whereof I affix my signature.

WALTER W. WOOD.

